Imam A'zam Abu Hanifa, Imam Maalik, Imam  Shaafi and Imam Ahmed bin Hambal (radi Allahu anhumul ajma'in)are  the leaders of the four schools of Fiqh (Islamic Law).
 "FIQH" is the Science of Islamic  Law or Jurisprudence. It refers to the collection and compilation of Islamic  laws based on the Holy Quran and the Sunnah of Sayyiduna Rasulullah (sallal  laahu alaihi wasallam). These great Muslims devoted themselves to the task  of developing the science of understanding Islamic Law and its practise.
 Although they differed from each other, all  the four great Imams had great respect for each other. They were all teachers  and pupils of each other for the common goal of enhancing their knowledge about  Islam. All of them were unanimous on Aqa'ids (Islamic Beliefs). We, as Muslims,  must respect the different Sunni schools of thought.   
 
Mohammed bin Idris Al Shaafa'ee (radi  Allahu anhu) famously known as Imam Shaafa'ee was born in 150 A.H. and  belonged to the Quraish tribe.
  When the Governor of Iraq visited Madinatul Munawwarah, he was  so impressed by Imam Shaafa'ee (radi Allahu anhu) that he persuaded him  to become an Administrator. As Imam Shaafa'ee (radi Allahu anhu) was in  conflict with the Government officials, he was deported to Iraq and brought in  front of Haroun Rasheed who was very impressed with Imam Shaafa'ee (radi  Allahu anhu).
 On his way to Egypt, he lectured in Makkatul Mukarramah in the  Haram Shareef. Imam Ahmed bin Hambal (radi Allahu anhu), who was studying  at the time in Makkatul Mukarramah found great benefit from these lectures. Imam  Shaafa'ee (radi Allahu anhu) then went to Baghdad where he spent 3 or 4  years and finally went to Egypt. He was now 50 years old.
In Egypt, scholars from all over the world came to study at  his feet. His famous pupils were Sayyiduna Rabi bin Sulayman, Sayyiduna Abu  Yacoob Al Ruwayta and Sayyiduna Abu Ebraheem bin Yahya Al Muzani (radi Allahu  anhumul ajma'in).
HIS WORKS
Some reports say that he was injured seriously by a person  called Fityan, while other reports mention that he passed away through natural  illness on the last day of Rajab in the year 204 A.H.in Egypt. Maalik Al Kaamil,  the Ayyubid Sultan, built a Mazaar for him in 608 A.H.